Apparatus for forming single faced corrugated boards



Jan. 30, 1968 w. E. BRINEY 3,366,527

APPARATUS FOR FORMING SINGLE FACED CORRUGATED BOARDS 7 Filed July l7, 1964 INVENTOR. \AHLLIPIm EJBRiNEY BY ?i,9 [G 4 HTTQRNEVS United States Patent 3,366,527 APPARATUS FOR FQRMENG SINGLE FACED CORRUGATED BOARDS Wiliiarn E. Briney, Toledo, Ohio, assignor to Owens- Illinois Glass Company, a corporation of Ohio Filed July 17, 1964, Ser. No. 383,327 6 Claims. (6i. 156-473) ABSTRACT OF THE DISCLGSURE This application discloses a corrugating machine for making corrugated paperboard in which the curved guides for guiding the corrugated web on the corrugating roll are provided with passages extending therethrough in the area of the nip between the corrugated roll and the adhesive roll for applying adhesive to the tips of the web in engagement with the guides, thereby to produce corrugated paperboard without dry streaks.

This invention relates to apparatus for forming single faced corrugated paperboard.

More particularly, this invention relates to apparatus for forming corrugated paperboard, wherein the facing is applied to the corrugations by adhesives without the usual dry streaks caused by the conventional paper guides.

In the production of corrugated paperboard, particularly of the single face type, it is desirable that the facing be adhered to the crests of the corrugation throughout the entire width of the board by uniform application of adhesives to the crests and then applying a liner to the adhesive carrying crests.

As is well known, the corrugating rolls which form the corrugations are the type which in the normal process are heated so as to dry the paper and in the drying process the paper becomes somewhat set in its corrugating configuration.

In order that the corrugated paper become uniformly formed it has been found necessary to maintain the corrugated paper in the corrugations of the corrugator roll for as long as possible in its travel to effect the desired drying and also to retain the shape of the corrugations as to their uniformity for as long as possible.

With this in mind, it is the present practice to use spaced-apart paper guides which have an arcuate shape paralleling the circumference of the corrugated roll and to utilize the paper guides to hold the corrugated paper in the corrugations of the roll until such time as the corrugated paper is applied to the liner.

It is also now common practice to apply the adhesive to the crests of the corrugated paper while the paper is maintained in contact with one of the corrugating rolls. This has been accomplished in the past by providing an adhesive roll which is driven in contact with the paper carried by the corrugated roll. However, it was found that when producing corrugated paper of a width less than the full width of the corrugated roll, it was desirable to not have the adhesives applied to the bare corrugated roll, from the standpoint that it produces an undesirable condition requiring later cleaning.

With this in mind, and as taught in US. Patent No. 1,106,502, dated Aug. 11, 1914, a system was devised wherein the adhesive roll was spaced from the corrugating roll and the paper guides were formed such that the paper woud fiull out against the adhesive roll and then in this manner the adhesive would be applied to the crests of the corrugated paper. It can readily be appreciated that this system has certain disadvantages from the standpoint that the fluffing out or separation of the paper from the corrugator roll requires the fingers or guides to push the paper back into the corrugated roll after the application of the adhesive. This disturbs the uniformity of the corrugations of the paper and in some instances has resulted in tearing the corrugated paper resulting in an unsatisfactory product, down time and loss of continuous production. Even in the prior art systems wherein glue fingers or paper guides have been used, it should be readily appreciated that the area of the corrugated paper which is in contact with the paper guide will not have any adhesive applied thereto and the resultant single face paperboard will have what are termed dry streaks. Dry streaks are where the adhesive is not present between the crests of the corrugated paper and the liner paper.

The present invention is concerned with the forming of corrugated paperboard on a continuous basis, wherein the dry streak condition is eliminated thus resulting in a product which is superior in strength and durability to that presently formed wherein dry streaks are the accepted condition.

In view of the foregoing, it is an object of this invention to provide apparatus for forming single faced corrugated board wherein the adhesive is uniformly applied to the crests of the corrugated paper throughout its entire width.

It is an additional object of this invention to provide a new paper guide which does not interfere with the application of adhesives to the crests of the corrugated paper.

It is a further object of this invention to provide a paper guide having adhesive conducting means formed integral therewith for assuring uniform adhesive application to the crests of the corrugated paper.

Other and further objects Will be apparent from the following description taken in conjunction with the annexed sheet of drawings, wherein:

FIG. 1 is a diagrammatic view showing the operations of a conventional corrugatiug process;

FIG. 2 is a partial view on an enlarged scale of the portion of FIG. 1 showing the detailed arrangement of the adhesive applying roll and the corrugating roll;

FIG. 3 is a plan view of the paper guide of the inve11 tion; and

FIG. 4 is a side elevational view of the FIG. 3.

With reference to the drawings, the apparatus of the invention will now bedescribed in detail.

A pair of corrugator rolls 1%) and 11 have precisely formed surfaces which interrnesh so that as the corrugating medium or paper 12 is fed between the intermeshing rolls it) and 11, it will be corrugated. A liner sheet 13, which comes from a suitable source of supply (not shown), passes around a heated pressure roll 14 which presses the liner sheet 13 against the crests of the corrugations of the corrugated sheet or corrugated medium just before the corrugated sheet 12 leaves the bottom corru ating roll 11. The liner sheet 13 is fixed to the corrugated sheet 12 by means of an adhesive or glue supplied by a glue roll 15 located beneath the bottom corrugating roll 11 in position for applying the glue or adhesive contained in the supply chamber 16 to the crests of the corrugations of the corrugated sheet as it passes around the bottom corrugating roll 11.

The apparatus is provided with a series of paper guides or glue fingers 17 that are spaced apart longitudinally of the corrugating rolls 10 and 11. The guides 17 are located in annular grooves 18 and 19 formed in the top corrugating roll 10 and glue roll 15 respectively.

The function of the guides 17 is to strip the corrugated sheet 12 from the top corrugating roll 10 and hold the corrugated sheet snugly in the corrugations of the bottom corrugating roll 11 during its travel about the periphery of the roll 11.

paper guide of Serious drawbacks are presented with respect to the arrangement thus far described, the most serious of which is that it is necessary to have a plurality of guides 17 spaced apart longitudinally of the corrugating rolls and 11 at intervals of from two inches to four inches. This obviously requires annular grooves 18 and 19 formed in the glue roll for accommodating the guides 17. These grooves normally result in a discontinuous glue line across the width of the corrugating medium with resulting loss of bond strength.

Turning now specifically to FIGS. 2-4, wherein the specific structure of the glue fingers or paper guides 17 is disclosed, it can be seen that the glue fingers 17 are made up of a pair of arcuate metal members 20 and 21.

As can be seen when viewing FIGS. 2 and 4, the members 20 and 21 are held in alignment by a pair of intermediate arcuate members 22 and 23 which are riveted to form a single glue finger or paper guide 17. The juxtaposed ends of the members 20 and 21 are spaced apart a short distance so as to form an opening 24 therebetween. This opening 24 forms an adhesive conducting means which is positioned in relation to the length of the glue finger 17 such that it coincides with the nip region between the corrugated roll 11 and the adhesive roll 15. Obviously, the adhesive roll 15 will pick up adequate adhesive from the glue chamber 16 and there will be glue riding in the groove 19. Inasmuch as the direction of the opening 24 is oriented with respect to direction of rotation of the adhesive roll 15, a portion of the adhesive carried within the groove 19 will be fed through the opening 24 and thus be applied to the crests or tips of the corrugated medium 12. This then provides a means for insuring that adhesive will be present on the corrugated medium where, under prior practice, dry streaks would appear.

The total width of the guide 17 at the location of the opening is only slightly greater than the presently used glue fingers or paper guides. However, with the opening formed in the glue finger positioned such that it will apply glue to the center of the area beneath the glue fingers, corrugated board is produced which is of a better quality.

Thus it can be seen that as the corrugated medium is conveyed past the adhesive roll on its way to the liner applying roll, the forming of dry streaks is prevented and the opening 24 is maintained clear by the fact that the glue, in effect, is pushed or pumped through this opening due to the rotational speed of the glue applicator roll 15.

While the above description has been primarily directed to the forming of single faced corrugated board, it should be obvious that, in the normal operation of forming double faced or double corrugated boards, it is always necessary that the first single face he produced and it is intended that this invention will relate to the forming of double faced or additional Wall board of the corrugated type.

Various modifications may be resorted to within the spirit and scope of the appended claims.

I claim:

1. In a machine for making corrugated paperboard, the combination of a corrugated roll rotatable about an axis and constructed to mesh with a continuous corrugated web for conveying said web past an adhesive roll to a liner-applying roll, an adhesive roll arranged to apply adhesive to the outwardly presented tips of said corrugated web as said web is conveyed thereby around the rotary axis of said corrugated roll, said adhesive roll having grooves, a series of guides received by said grooves and guiding the web on the corrugating roll, said guides having a passage extending therethrough in the area of the nip between the corrugated roll and the adhesive roll.

2. The apparatus as defined in claim 1, wherein the passages in said guides extend therethrough in a direction which parallels the direction of approach of the adhesive roll to the corrugated roll.

3. In a machine for making corrugated paperboard, the combination of a corrugated roll rotatable about an axis and constructed to mesh with a continuous corrugated web for conveying said web past an adhesive roll to a liner-applying roll, an adhesive roll arranged to apply adhesive to the outwardly presented tips of said corrugated web as said web is conveyed thereby around the rotary axis of said corrugated roll, said adhesive roll having grooves, a series of guides received by said grooves and guiding the web on the corrugating roll, said guides having adhesive conducting means formed therein in the area of the nip between the corrugated roll and the adhesive roll for applying adhesive to the tips of said web in engagement with the guides.

4. The apparatus as defined in claim 3, wherein said guides comprise arcuate shaped members having a radius of curvature approximating the curvature of the corrugated roll.

5. The apparatus as defined in claim 4, wherein said guides are formed of two arcuate members positioned end-to-end with a gap between their adjacent ends, said gap forming said adhesive conducting means.

6. The apparatus as defined in claim 5, further including a pair of arcuate strips joined to opposite side of said arcuate member and bridging said gap formed therebetween.

Reterences Cited UNITED STATES PATENTS 1,106,502 8/1914 Ferres 156-473 1,186,997 6/1916 Langston 156473 3,220,911 11/1965 \Verner 56473 EARL M. BERGERT, Primary Examiner.

H. F. EPSTElN, Assistant Examiner. 

